Split out export actions into own controllers

app/Http/Controllers/BookExportController.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace BookStack\Http\Controllers;
+
+use BookStack\Entities\ExportService;
+use BookStack\Entities\Repos\EntityRepo;
+use BookStack\Exceptions\NotFoundException;
+use Throwable;
+
+class BookExportController extends Controller
+{
+    /**
+     * @var EntityRepo
+     */
+    protected $entityRepo;
+
+    /**
+     * @var ExportService
+     */
+    protected $exportService;
+
+    /**
+     * BookExportController constructor.
+     * @param EntityRepo $entityRepo
+     * @param ExportService $exportService
+     */
+    public function __construct(EntityRepo $entityRepo, ExportService $exportService)
+    {
+        $this->entityRepo = $entityRepo;
+        $this->exportService = $exportService;
+        parent::__construct();
+    }
+
+    /**
+     * Export a book as a PDF file.
+     * @param string $bookSlug
+     * @return mixed
+     * @throws NotFoundException
+     * @throws Throwable
+     */
+    public function pdf(string $bookSlug)
+    {
+        $book = $this->entityRepo->getBySlug('book', $bookSlug);
+        $pdfContent = $this->exportService->bookToPdf($book);
+        return $this->downloadResponse($pdfContent, $bookSlug . '.pdf');
+    }
+
+    /**
+     * Export a book as a contained HTML file.
+     * @param string $bookSlug
+     * @return mixed
+     * @throws NotFoundException
+     * @throws Throwable
+     */
+    public function html(string $bookSlug)
+    {
+        $book = $this->entityRepo->getBySlug('book', $bookSlug);
+        $htmlContent = $this->exportService->bookToContainedHtml($book);
+        return $this->downloadResponse($htmlContent, $bookSlug . '.html');
+    }
+
+    /**
+     * Export a book as a plain text file.
+     * @param $bookSlug
+     * @return mixed
+     * @throws NotFoundException
+     */
+    public function plainText(string $bookSlug)
+    {
+        $book = $this->entityRepo->getBySlug('book', $bookSlug);
+        $textContent = $this->exportService->bookToPlainText($book);
+        return $this->downloadResponse($textContent, $bookSlug . '.txt');
+    }
+}